package com.ohs.ohsoa.utils.auth;

import java.lang.reflect.Method;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.ohs.ohsoa.system.service.UserInfoService;
import com.ohs.ohsoa.system.vo.UserInfoVo;

public class AuthenticationInterceptor implements HandlerInterceptor {

	@Resource
	UserInfoService userInfoService;
	

	@Resource
	private TokenService tokenService;
	
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
            Object object) throws Exception {
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        // 检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        // 检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                	httpServletResponse.setStatus(401);
                    throw new RuntimeException("トークンが存在しないですが、ご再度ログインしてください。");
                }
                
                UserInfoVo userInfoVo = userInfoService.getUserInfo();
                if (userInfoVo == null) {
                	httpServletResponse.setStatus(401);
                    throw new RuntimeException("トークンが存在しないですが、ご再度ログインしてください。");
                }
                // 验证 token
                JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(userInfoVo.getPwd())).build();
                try {
                    jwtVerifier.verify(token);
                } catch (JWTVerificationException e) {
                	httpServletResponse.setStatus(401);
                    throw new RuntimeException("トークンの期限が切れましたが、ご再度ログインしてください。");
                }
                return true;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o,
            ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
            Object o, Exception e) throws Exception {

    }
}
